Rotary nut-cracking machine having reciprocatory jaws



April 24, 1951 1.. B. BERG ET AL ROTARY NUT CRACKING MACHINE HAVING RECIPROCATORY JAWS 7 Sheets-Sheet 1 Filed Dec. 1, 1947 I INVENTOR. MBA? 5. 14 244; wlTNfissgr wfim w U ATTORNEY 7 Sheets-Sheet 2 FIG.

L. B. BERG ET AL ROTARY NUT CRACKING MACHINE HAVING RECIPROCATORY JAWS April 24, 1951 Filed Dec. 1, 1947 W 5 5i & i 6 p wnuessynkwa. h fiw gay ATTORNEY April 24, 1951 B. BERG ET AL ROTARY NUT CRACKING MACHINE HAVING RECIPROCATORY JAWS '7 Sheets-Sheet 3 Filed Dec. 1, 1947 INVENTOR.

ATTORNEY WITNESS Wann /WWW April 24, 1951 B. BERG ET AL ROTARY NUT CRACKING MACHINE HAVING RECIPROCATORY JAWS 7 Sheets-Sheet 4 Filed Dec. 1, 1947 INVENTOR.

BY 2: ATTORNEY 'WITNE5S% QM M April 24, 1951 1.. B. BERG ET AL ROTARY NUT CRACKING MACHINE HAVING RECIPROCATORY JAWS 7 Sheets-Sheet 5 Filed Dec. 1, 1947 RN MK INVENTOR. Q 0%,

AI TOR NEY WlTNESS yriw a 41m April 24, 1951 L. B. BERG ET AL ROTARY NUT CRACKING MACHINE HAVING RECIPROCATORY JAWS 7 Sheets-Sheet 6 Filed Dec. 1, 1947 R m mw ZL W EW @MH WI I l i wl'ma'ssyih/ Qlhw ATTORNEY April 24, 1951 L. B. BERG ET AL 2,549,831

ROTARY NUT CRACKING MACHINE HAVING RECIPROCATORY JAWS '7 Sheets-Sheet '7 Filed Dec. 1, 1947 FIG.

FIG. ll

INVENTOR. lG/C? FIG. 14

5 WlTNESS MUM BY ATTORNEY Patented Apr. 24, 1951 ROTARY NUT-CRACKING MACHINE HAVING RECIPROCATORY JAWS Louis B. Berg, Chicago, Ill., and John E. Martin, San Antonio, Tex., assignors, by mesne as signments, to Robert Wilson Carter, Luling,

Tex.

Application December 1, 1947, Serial No. 789,004

8 Claims.

This invention relates generally to machines for cracking the shells of edible nuts, and more specifically to a machine of this character which includes a rotatable drum that supports for rotation therewith a plurality of nut cracking units which are actuated in sequence as the drum is rotated to crack nuts between dies forming parts of said nut cracking units, the predominant object of the invention being to provide a machine characterized as described above which is capable of performing its intended function at very high speed and in a highly efficient manner.

Fig. 1 is a vertical sectional iew of the machine taken on the line |--I of Fig. 3, parallel with the drive shaft of the machine.

Fig. 2 is a plan view of Fig. 1 illustrating the machine with the dies, spindles and spindle bearings removed.

Fig. 3 is an end elevational view of the machine as seen from the left hand end of Fig. 1.

Fig. 4 is an end elevational view of the machine as seen from the right hand end of Fig. 1.

Fig. 5 is an enlarged fragmentary sectional view taken on the line 5--5 of Fig. 1.

Fig. 6 is an enlarged elevational development of the nut cracking mechanism as viewed along the line 6-6 of Fig. 3 with two of the cracking units broken out.

Fig. 7 is a sectional view taken on the line '!T of Fig. 6.

Fig. 8 is a sectional view taken on the line 8-8 of Fig. 6.

Fig. 9 is a sectional view taken on the line -9 of Fig. 6. V

Fig. 10 is a sectional view taken on the line I0-|0 of Fig. 6.

Fig. 11 is an enlarged fragmentary sectional view taken on the line HI l of Fig. 1.

Fig. 12 is a sectional view taken on the line l2-1l2 of Fig, 11.

Fig. 13 is an enlarged fragmentary sectional view taken on the line l3-l3 of Fig. 1.

Fig. 14 is a sectional view taken on the line I4-l4 of Fig. 5.

Fig. 15 is an enlarged sectional view taken on the line I5--|5 of Fig. 1.

In describing the machine of the present invention attention is directed first to Figs. 1, 2 and 5, wherein is illustrated a machine which includes a suitable base I, which is provided for the support of a motor 2, a hopper 3 and a pair of spaced pedestals 4. A drive shaft 5 is supported at one end in one of the pedestals 4 and near its other end by the cam drum 6 which is secured against rotation in the other pedestal by the cap 1. The

outer end of the shaft 5 is provided with and supports a worm gear driving mechanism generally denoted by the numeral 9, the mechanism floating on the shaft 5 and being provided with the lug I0 which projects into a slot in the pedestal on that end of the machine. A screw ll (Fig. 15) provides a means of eliminating excess slack between the lug l0 and the slot walls, whereby the unit 9 is prevented from rotating about the axis of the shaft 5. Power for operation of the machine is obtained from the motor 2 through the belt I2, and mounted on the shaft 5 and rotatable therewith, is a cracking drum l3 provided at one end with an annular flange [4 in which a plurality of cracking dies I5 are rigidly mounted. Attached to the periphery of the drum 13 are a plurality of bearing blocks It in axial alignment with the dies l5, these bearing blocks being bored to receive spindles I1 and the spindles being provided at corresponding ends with cracking dies 18 and at their opposite ends with the cam shoes l9 and the rollers 2!]. Compression springs 2|, interposed between the bores of the bearing blocks and the spindles, serve to impart the positioning motion to the spindles at the proper time. Slidably mounted on the spindles ll, adjacent the cam shoes l9, are looking units, generally denoted by the reference, character 22, these units being prevented from rotating on the spindles by the shaft 23. The function of these units will be explained later herein.

Mounted in the flange l4 and the adjacent ends of the bearing blocks 16 are shafts 24 whose outer ends are bent to form cranks 25, and rigidly at-' tached to the shafts 24 are arms 26 carrying at their outer ends buckets 21, said buckets 21 being normally held in their outermost positions by the action of torsional coil springs 28. Attached to the periphery of the flange 14 and to portions of the bearing blocks l6 are plates 29 provided with pick-up fingers 30. It will be noticed that the plates 29 do not entirely cover the periphery of the flange and bearing blocks but are of such length that a passage way is left for passage of nuts from the pick-up fingers SE! to the buckets 2'! and provide an opening for discharge of the nuts after cracking. A plate 31 is supported from the cap of the pedestal 4 at the left-hand end of the machine as it is illustrated in Fig. 1, this plate 3| being provided at its periphery with serrations 32, a dwell 33, a rise 34 and a second dwell 35 all engageable with the cranks 25 of the shafts 24. A second plate 36 is supported from the same pedestal 4 and has serrations 31 on its periphery also engageable with the cranks 25.

An examination of Fig. 5, which shows the drum l3 rotating in a counter-clockwise direction, will serve to illustrate the functions of the cranks 25, the buckets 21, the pick-up fingers 30 and the plates 3i and 36. It will be noticed that, as the drum rotates, the pick-up fingers 35 projecting from its periphery pass through the opening 38 (Fig. 14) in the bottom of the hopper 3. This opening is partially closed by the strip 39 so as to prevent nuts from falling through the opening and said opening communicates with the slot iii provided in the inner wall of the hopper to allow passage of the shank 4| of the pick-up fingers. Thus, as the pick-up fingers pass through the hopper they will pick up nuts which will be carried beyond the upper edge of the hopper. After passing the upper edge of the hopper, the nuts will roll, or fall, by gravitation into the buckets 21. Since it is imperative, in order to properly crack the shell of a nut, that the cracking force applied to the nut shall be in the direction of its longitudinal axis, and, since the nut may fall into the buckets supported by the shafts 24 in any position, the following arrangement is employed to properly position the nut between the cracking dies I and I8.

Immediately after a nut enters one of the buckets 2'! the crank 25 related to said bucket encounters the serrations 32. on the stationary plate 3! thereby causing a slight agitation of the bucket 21 which allows the nut, if not already lying properly in the bucket, to gravitate to the proper position with its longitudinal axis parallel to the direction of the cracking force to be applied. Prior to engagement of the nut by the cracking dies the dwell 33 causes the nut to be centered with relation to the cracking dies (see the uppermost die position of Fig. 5).

After engagement of the nut by the cracking dies i5 and i8, and prior to the application of, the crushing force, the rise 34 on the plate 3| causes the bucket 27 to move inwardly, away from the nut. This is shown in the next die position to the left of the uppermost die position of Fig. 5. Thus, during the actual cracking period the nut is suspended between the cracking dies and spreading of the shell during the cracking operation is not interfered with by contact withany portion of the bucket 21. After cracking of the shell and release of the nut by the cracking dies the cracked nut is free to fall, by gravity, from the bucket 21 into a suitable discharge chute 42 and thence to any desired container or conveyor fo further processing. Occasionally a nut will adhere to the bucket 21 instead of dropping out freely and in order to overcome this fault the serrations 37 on the plate acting in conjunction with the cranks 25 serve to agitate the buckets 2'! suificiently to dislodge the nut or any adhering fragments thereof. After discharge of the nut from a bucket 21 the cycle described above is, of course, repeated.

In describing the action of the cracking dies, attention is invited to Figs. 1 and 2 and Figs. 5 to 12, inclusive. As stated above, the drum [3 rotates with the shaft 5 carrying with it the dies 55, the blocks 15, spindles I1 and buckets 21, while the cam drum 5 is stationary. The drum 8 is provided with a cam-groove 43, a flange 44 and a cam portion 45 (Fig. 2).

It may be well at this point to describe the locking unit, generally denoted by the numeral 22. This unit consists of two related elements 35 and i? fastened together by suitable screws 48 and bored for a sliding fiton the spindle l'l (Figs.

11 and 12). The outer portion of the unit is provided with a groove 49 formed to slidably fit the shaft 23 in order to prevent rotation of the unit on the spindle H. The inner portion of the unit is provided with a rectangular opening 50 in which is mounted, by means of a pin 52, a locking block 5i. 'It will be noticed that the end of the locking block adjacent the spindle is formed with an eccentric radius in such manner that oscillation of the block about the pin 52 in a clockwise direction will cause the end of the block to bear against the spindle while oscillating the block in the opposite direction will move the end. of the block away from the spindle. The end of the block opposite the spindle is provided with the round projection 53 and is fitted with a roller 54 the outside of which is formed with a spherical radius to fit the groove 43 in the drum 6. A suitable abutment element 55 is employed to limit the oscillation of the block in a counterclockwise direction in order to eliminate unnecessary slack in the mechanism. Attached to the face of the unit on the side next to the drum i3 by means of a keeper 56is a thin plate 51 bored slightly larger than the spindle'over which it fits. This plate is held on one side only by the keeper 56 and is normally held in an angular position, as shown by the full lines in Fig. 12, by the action of a pair of compression springs 58 inserted in holes in the body of the unit. Thus the plate 5! tends normally to bind the spindle against movementrelative to the unit in a left hand direction. The end of the plate 5'! opposite the position of the keeper 56 is provided with an extension 59 adapted to engage the portion 45 of the drum 6 for moving the plate to theposition indicated by the dotted lines of Fig. 12. In this position the bore of the plate is in alignment with the axis of the spindle and therefore, the spindle is free to slide through the plates.

The outer end of the shaft 23 is provided with a slidable coupling 60 limited in its movement by the shoulder 65 and the washer 62, the outer end portion of the coupling 60 being provided with screwthreads to which is fitted the adjusting cap 63. .A crush adjusting strip 65 (Fig. 6) is pivoted at one end thereof to a bracket 65 by a pin 66 and said strip is hinged at-its other end to an adjusting screw 6'! provided with the nut 68, a compression spring 69 being provided'to hold the nut 68 in engagementwith the bracket 55.

Referring to Fig. '7, which corresponds with the uppermost die position of Fig. 5, it will be noticed that the locking unit 22 is contacting with an end of the coupling 55, the locking block 51 is inclined in a counterclockwise direction, the plate 57 is held against the face of the locking unit 22 by the portion 45 of the'drum 6, the spring 2! is compressed, and the roller 28 is contacting the face of the fianged i. The shaft 23 is adjustable in the bearing block it so that further outward movement of the locking unit 22 will be prevented by contact of the end of. the coupling 60 With the washer G2, and this arrangement assures a positive unlocking action on the block 51 through the action-of the groove' is and the roller 54. Since a uniform distance from the inner end of the coupling 60 to the tip of the cap 63 is essential on all cracking units and to compensate for inaccuracies in manufacture, the cap 63 is made adjustable on the coupling (iii. These conditions are imperative in order to secure positive uniform ing of thenuts. a

As the drum [3 rotates,theroller-Zhenbounters and adjustable. crack the helical portions of the flange 44 and there now being no resistance to the action of the spring 2|, the spindle ll advances to the position shown in Fig. 8 which is the position of the parts just prior to the application of the cracking force. This is the point at which the nut (not shown) is positioned in the cracking dies, the nut having been omitted in this instance stalling of the machine. This construction, however, permits all nuts to the minimum capacity of the dies to be properly cracked. In Fig. 8 the tip of the cap 63 is just contacting the crush adjusting strip 64 and if the other end of this strip occupies the position indicated by the full lines of Fig. 6 the full amount of crushing movement available from the contour of the groove 43 will be imparted to the spindle. However, when working with nuts that do not require the maximum crush the strip 64 may be adjusted to some other position as indicated by dotted lines in Fig. 6, and, since the coupling 60 is moved inwardly as the cap 63 moves along the adjusting strip 64 the locking unit will also move inwardly and maintain the locking block 6| in a counterclockwise inclined or unlocked position for a portion of the crushing contour of the groove 43 depending upon the setting of the adjusting strip. The positions of the parts at the end of the crushing movement are shown in Fig. 9. vI-Iere it will be seen that when no nut is between the dies they come practically together. However, in the event a nut was positioned between the dies at the beginning of the cracking period the die 18 would occupy some other position dependingupon the size of the nut.

After the cracking operation is complete the contour of the groove 43 moves the roller 54 along with the locking unit 22 and the spindle I'l outwardly until the locking unit contacts the coupling 68, whereupon the locking block 5| will be oscillated in a counterclockwise direction thereby unlocking the unit from the spindle. At this point it will be observed that the spindle l1 and its die l8 have started to release the cracked nut, and upon release of the spindle by the locking unit the spring 2| will tend to move the spindle and die into engagement with the cracked nut again since all during the cracking period there is clearance between the portion H of the flange 44, and the roller 20.

However, any-second engagement of the die I8 is still a 6 from the hopper 3 and positioned in the bucket 21, whereupon the cycle is repeated.

In order to prevent nuts or shell fragments from adhering to the cracking surfaces of the dies l5, each of said dies is provided with a threaded shank whereby a cap 13 may be employed to secure the die in the flange l4 of the drum l3. A longitudinal bore extends through the die and cap for the reception of an ejector pin 14 and a counterbore is provided in the cap 13 to accommodate a pin 15 which extends from each side of the ejector pin to engage with a compression spring 16. The spring 16 normally holds the ejector pin in the position illustrated in Figs. 7, 8, and 9, but after cracking of the nut is complete, continued rotation of the drum I3 causes the ejector pin 14 to pass over a roller 71 supported by the left hand pedestal 4 of the machine. When this occurs the pin 14 is forced inwardly against the resistance of the spring 16 and any nuts or shell fragments adhering to the die are dislodged. Also, it will be noticed that the inner ends of the dies l5 are provided with the flanges l8 and as the dies [8 move forwardly in the buckets 21 for positioning the nuts, a scooping action due to the angularity of the cracking surface of the.

die tends to raise the rear end of the nut and lower the front end. In working with nuts whose ends approximate a point, this point, if the die 15 were shaped similar to die l8, would tend to catch under the lower edge of the die l5. By eliminating the sharp edge of the die with the flange 18 this fault is largely overcome. As a further aid in correctly positioning the nut in the dies the floor of each of the buckets 21 is inclined slightly upwardly as it approaches the die l5 as indicated at 21. Thus, the front end of the nut is raised into proper position in the die by such raised portion of the bucket floor.

The body of each of the dies [8 is threaded to receive the die facing 19 and counterbored to accommodate a compression spring 80. Also, each die l8 has associated therewith an ejector pin BI and a die ejector pin actuator 82 which projects through one of the slots 83 in the side of the body and extends longitudinally along the outside of the die to a point proximate its end where it is provided with a hook 84 adapted to engage the edge of the bore of the bearing block l6 when the die 18 is in its open position. The spring normally holds the ejector pin 8| in its retracted position as shown in Figs. 8 and 9 so "long as the die projects beyond the end of the bearing block [6. However, when the die moves to its open position as shown in Figs. 7 and 10, the hook 84 engages the end of the bearing block I 6 and projects the ejector pin 8| through the bore of the die, against the resistance of the spring 80, thereby dislodging any nut or shell fragments adhering to the face of the die.

From the foregoing disclosure it is apparent that this machine is continuous and entirely automatic in operation, that reciprocating parts are reduced to a minimum, and that the machine is compact in construction and efficient in operation.

While a preferred structure of the machine is herein disclosed it is to be understood that such structural changes, or alterations, may be made as will add to the efficiency of the machine so long as these changes do no-t depart from the spirit of the invention.

We claim:

1. A nut cracking machine comprising a supporting structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut cracking units including each a pair of cracking dies one of which is adapted for reciprocatory movement with respect to the other, means for moving the reciprocatory die of each nut cracking unit toward its related die so as-to position said recip rocatorydie for a nut cracking operation, means common to all of said not cracking units for sequentially subjecting the reciprocatory dies of the respective nut cracking units to nut-cracking movement, and a locking unit associated with each nut crackling unit and rotatablymovable with said drum for locking the reciprocatory die of each of the nut cracking units inposition to receive said nut-cracking movement, said means for subjecting the reciprocatory dies of the nut cracking units to nut-cracking movement comprising a stationary drum having a circumferential cam groove formed therein, and said locking units being provided with rollers which move through sad circumferential cam groove of said stationary drum.

2. A nut cracking machine comprising a supporting structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut cracking units including each a pair of cracking dies one of which is supported for reciprooatory movement by a reciprocatory spindle, means for moving the reciprocatory die of each nut cracking unit toward its related die so as to position said reciprocatory die for a nut cracking operation, means for sequentially subjecting the reciprocatory dies of the respective nut cracking units to nut-cracking movement, and a locking unit associated with each nut cracking unit and rotatably movable with said drum for locking the reciprocatory die of each of the nut cracking units in position to receive said nut-cracking movement, said locking unit including a pivotally movable elementmovable into binding engagement with the spindle of the reciprccatory die of the related nut cracking unit.

3. A nut cracking machine comprising a supporting structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut cracking units including each a pair of cracking dies one of which is supported for reciprocatory movement by a recinrocatory spindle, means for moving the reciprocatory die of each nut cracking unit toward its relateddie so as to position said reciprocatory die for a nut cracking operation, means for sequentially' subjecting the reciprocatory dies of the re.-. spective nut cracking units to nut-cracking movement, and a locking unit associated. with each nut cracking unit and rotatably movable with said drum for locking the reciprocatory die of each of the nut cracking units in position to receive said nut-cracking movement, said locking unit including a pivotally movable element hav ing an eccentric face whichis movable into binding engagement with the spindle of the reciprocatory die of the related nut cracking unit.

4. A nut cracking machine comprising a supportin structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut cracking units including each a pair of cracking dies one of which is supported for reciprocatory movement by a reciprocatory spindle, means for moving they reciprocatory die of each nut cracking unit toward its related die so as to position said reciprocatory die for a nut cracking operationimeans. for sequentially. subjecting the reciprocatory dies of the respective nut cracking units to nut-cracking movement, and a locking unit associated with each nut cracking unit and rotatably movable. with said drum for locking the reciprocatory vdie of each of the nut cracking units in position to receive said nut-cracking movement, said locking unit including a pivotally movable element having an eccentric face which is movable into binding engagement with the spindle of the reciprocatory die of the related nut cracking unit, and said means for sequentially subjecting the reciprocatory dies of the nut cracking units to nut-cracking movement'comprising a cam which is engaged by parts of said pivotally movable elements of said locking units.

5. A nut cracking machine comprising a supporting structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut cracking units including each a pair of cracking dies one of which,

is supported for reciprocatory movement by a reciprocatory spindle, means for moving the reciprocatory die of each nut cracking unit toward its related die so as to position said reciprocatory dielfor a nut crackin operation, means for sequentially subjecting the reciprccatory dies of the respective nut cracking units to nut-cracking movement, and a locking unit associated with each nut cracking unit and rotatably movable with said drum for locking the reciprocatory die of each of the nut cracking units in position to receive said nut-crackingmovement, said locking unit including a pivotally movable element having an eccentric face which is movable into binding engagement with the spindle of the reciprocatory die of the related nut cracking unit, and said means for sequentially subjecting the-reciprocatory dies of the nut cracking units to nutcracking movement comprising a cam which is engaged by rollers comprising parts of said pivotally movable elements of said locking units.

6. A nut cracking machine comprising a supporting structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut cracking'units including each a pair of cracking dies one of which is supported for reciprocatory movement by a reciprocatory spindle, means for moving the reciprocatory die of each nut cracking unit toward its related die so as to position said reciprocatory die for a nut cracking operation, means for sequentiallysubjecting the reciprocatory dies of the respective nut cracking units to nut-cracking movement, and a locking unit associated with each nut cracking unit and rotatably movable with said drum for locking the recip-rocatory die of each of the nut cracking units in position to receive said nut-cracking movement, said locking unit including a pivotally movable element having an eccentric face which is movable into binding engagement with the spindle of the reciprocatory die of the related nut cracking unit, and said means for sequentially subjecting the reciprocatory dies of the nut cracking units to nut-cracking movement comprising a stationary drum having a circumferential cam groove formed therein, and said pivotally movable elements of said looking units being provided with rollers which move through said circumferential cam groove of said stationary drum.

7. A nut cracking machine comprising a supporting structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut cracking units including each a pair of cracking dies one of which is adapted for reciprocator movement with respect to the other, means for moving the reciprocatory die of each nut crackin unit toward its related die so as to position said reciprocatory die for a nut cracking operation, mean for sequentially subjecting the reciprocatory dies of the respective nut cracking units to nut-cracking movement, a locking unit associated with each nut cracking unit and rotatably movable with said drum for locking the reciprocatory die of each of the nut cracking units in position to receive said nut-cracking movement, and manually operable means for regulating the degree of nutcracking movement imparted to the reciprocatory cracking dies, of said nut cracking units.

8. A nut cracking machine comprising a sup .porting structure, a main shaft rotatably supported by said supporting structure, a drum fixedly mounted on'said main shaft for rotation therewith, a plurality of nut cracking units supported by said drum and spaced circumferentially with respect thereto, said nut crackin units including each a pair of cracking dies one of which is adapted for reciprocatory movement with respect to the other, means for moving the reciprocatory die of each nut cracking unit toward its related die so as to position said reciprocatory die for a nut cracking operation, means for sequentially subjecting the reciprocatory dies of the respective nut cracking units to nut-cracking movement, a locking unit associated with each nut cracking unit and rotatably movable with said drum for locking the reciprocatory die of each of the nut cracking units in position to receive said nut-cracking movement, and pivotally supported and manually adjustable means for regulating the degree of nut-crackin movement imparted to the reciprocatory cracking dies of said nut cracking units.

LOUIS B. BERG. JOHN E. MARTIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Date 

